<!DOCTYPE html>
<html lang="en">
<head>



    <meta charset="UTF-8"><meta name="robots" content="noindex">
    <style>
        * {
        font-family: sans-serif;
    }

    .box {
        margin: 20px auto;
        display: block;
        width: 800px;
        height: 400px;
        border: 2px solid red;
    }

    .box:after {
        content: "已报销";
        font-size: 600%;
        color: rgba(0, 0, 0, 0.15);
        border: 1px solid gray;
        z-index: 9999;
        display: block;
        position: relative;
        top: 25%;
        font-weight: bold;
        text-align: center;
        line-height: 100%;
        -webkit-transform: rotate(15deg);
        transform: rotate(15deg);
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
    }
    </style>
</head>
<body>
<div class="box">
    This is some content in the box
</div>

</body>
</html>